diff --git a/setup.py b/setup.py
index f79e7108a223e6daa90f90497b67f3e407871b49..619bb01b2920a7b83d6503cb64167fe64e49c97f 100644
--- a/setup.py
+++ b/setup.py
@@ -64,7 +64,7 @@ def execute_make():
 
 
 ###
-REQUIRED_BINARY_C_VERSIONS = ["2.1.7", "2.2pre1", "2.2.0"]
+REQUIRED_BINARY_C_VERSIONS = ["2.1.7", "2.2pre1", "2.2.0", "2.2.1"]
 
 ####
 GSL_DIR = os.getenv("GSL_DIR", None)